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Per operator: VIOLET must keep a "prior" on stale ExF rather than collapse to neutral, and the ACB's role must be commented-in + logged. - KEEP-PRIOR on stale/missing exf: BLUE keeps _day_base_boost/_day_beta on the stale branch (update_acb_boost isn't called). _source_boost_beta now takes `prior` (boost,beta) and returns it on ValueError / no-exf, seeded by the first successful compute. Threaded as `prior_boost_beta` through source_live_blue_sizing_factors (caller persists last good). - LOGGING: violet.live_blue_source logger emits live boost/beta + the full sourced plane. - SEMANTICS: documents the ACB in effect (inverse v6) and CONFIRMS ACB IS in the sizing layer via _day_base_boost/_day_beta → _update_regime_size_mult (esf_alpha_orchestrator.py:771-772, 898-909). OB Sub-4 beta modulation dormant in live — per operator found NON-PERFORMANT and deliberately bypassed; TODO_SOMEDAY in-code to find documentary confirmation. 37 tests. violet-only; no shared-file edits. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>